docs: def process(self, request_adu):
          """ Process request ADU and return response.
  
          :param request_adu: A bytearray containing the ADU request.
          :return: A bytearray containing the response of the ADU request.
          """
          meta_data = self.get_meta_data(request_adu)
          request_pdu = self.get_request_pdu(request_adu)
  
          response_pdu = self.execute_route(meta_data, request_pdu)
          response_adu = self.create_response_adu(meta_data, response_pdu)
  
          return response_adu